Question

Return the sum of count of 2 tables in a single select statement

Asked by: vinay518

hello all,

I have two tables t1 and t2,and I want to return the sum of counts of both the tables in a single query.

Suppose, t1 has 50 rows and t2 has 60 rows, the query should return 110 rows. t1 and t2 are temporary tables created daily, so no primary key has been defined on it though there are a couple of columns that are common to both. This can be done in a PLSQL block using variables to store the count of each table and add the counts and return the result using dbms_output but what I want is to do is return the result using a query.

I tried the following:
select count(t1.col1 + t2.col1)
from t1, t2 ;

but this doesnt work as it returns the cartesian product of the no.of rows.

Please suggest!

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Asked On
2006-01-23 at 08:03:19ID21706669
Tags

count

,

sum

,

2

,

query

,

select

Topic

Databases Miscellaneous

Participating Experts
2
Points
250
Comments
5

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Answers

 

by: wstuphPosted on 2006-01-23 at 08:10:35ID: 15767534

This would work on a MS SQL server:

select count(*)
from
(
select * from t1
union
select * from t2
) as a

 

by: jimhornPosted on 2006-01-23 at 08:11:04ID: 15767540

This works in SQL Server...

SELECT (SELECT Count(id) FROM YourTableName GROUP BY id) + (SELECT Count(id) FROM YourTableName GROUP BY id) as foo

 

by: vinay518Posted on 2006-01-23 at 08:49:57ID: 15767977

Thanks for the suggestions!

I am actually working on Oracle but the first comment worked. however what i am trying to do is :

select '1'||','||lpad(to_char(count(t1.col1)+(t2.col1)),10,'0')||','||lpad(to_char((count(t1.col1)+(t2.col1))*0100),11,'0')
from t1,t2;

I am not able to implement multiple queries in a single select statement for the above query.

Please suggest!

 

by: wstuphPosted on 2006-01-23 at 09:00:06ID: 15768065

so

select '1'||','||lpad(to_char(count(*)),10,'0')||','||lpad(to_char(count(*)*0100),11,'0')
from
(
select * from t1
union
select * from t2
) as a;

doesn't work?  What's the error?

 

by: vinay518Posted on 2006-01-23 at 09:04:47ID: 15768104

Hey ,
It worked ! Thanks, I  had to use "union all" instead of "union" to get the right no. of rows. I was just figuring it out . Thanks again!

20120131-EE-VQP-002

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